I was under my jeep the other day, and was going to check my trans fluid, but I noticed the fill and drain plugs have octagon shaped fittings, and not the usual square shape which the front and rear differentials use, which you can use regular ratchets to loosen. Any one have any idea what I can use to get them loose???

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Jerry he has the NV3550. It has the drain fill plugs he is talking about... I know because I also have that tranny.

I carry a bolt with countersunk nuts on it to get them out. Beats spending $10 for an allen key I will use once in a blue moon or lose.... it cost me less than a dollar and I can use a regular open ended wrench on the bolt to get the plugs in and out.

Thanks for the replies guys....well it turns out I needed to get a 17mm hex that I could use on a 3/8's ratchet. I looked around a few stores, and could not find one that size, the biggest they had was 10mm. I decided to go to the hardware store, and took a 17mm x 2 inch bolt, and screwed on two nuts, with this other kind of nut in the center which is fat on one side, and skinny on the other (I'm not sure of the name of this). This seems to work well, I was able to use my 3/8's ratchet with a spark plug socket and fitted the bolt on, it fit perfectlly into the hex fittings on the transmission, and I was able to get them out easily. I wish I could get a photo up here for the others to see, I think I spent only a $1.50 or so when everything was said and done, certainly worth the small investment.